Surface-gage



(160 Model.)

' H. AVERY.

SURFACE GAGE. N0. 267,660. Patented NOV. 21, 1882.

aiiorzzez UNITED STATES PATENT QFFICE.

HENRY AVERY, OF HARTFORD, CONNECTICUT.

SURFACE-GAGE.

SPEOIFIGATIONforming part of Letters Patent No. 267,660, dated November21, 1882, Application filed August 31, 1 882. (No model.)

' To all whom it may concern:

' Be it known that I, HENRY AVERY, of Hartford, in the county ofHartford and State of Connecticut, have invented certain, new and usefulImprovements in Surface-Gages; and I do hereby declare that thefollowing is a full, clear, and exact description thereof, whereby aperson skilled in the art can make and use the same, reference being hadto the accompanying drawings, and to the letters of reference markedthereon.

Like letters in the figures indicate the same parts.

My improvement relates to what are known as surface-gages, andtheobjectofmyinvention is to provide a better and readier means foradjusting the finger or pointer to a desired height, and also to providea clamping device for the pointer, which shall not have the defect ofloosening the screw when the pointer is turned in a vertical arc.

In theaccompanying drawings, illustrating my invention, Figure 1 is aview in elevation of my improved surface-gage. Fig. 2 is a viewat rightangles to Fig. 1. Fig. 3 is a view of the lower part of Fig. 2, with thebase in section, in order to show the interior parts. Fig.

4 is a horizontal section through the clamping device. Fig. 5 is adetail, which will be described.

A is the base.

B is the standard.

0 is the pointer.

D is the clamp-band, which can move up and down upon the standard and besecured in any position. It carries the pointer and fixes its height.

E is a hollow cylindrical sleeve, which is pierced with a hole throughits sides, in which the pointer G rests. 4

F is a collar which lies between the pointer and the side of the band D.It has semicircular notches, in which the pointer rests and moves withit and the sleeve E. The sleeve E passes through the collar F and entersa socket in D, in which it can turn freely. G is the clamp-screw. Itshead lies within the sleeve E, and its shank, provided with ascrew-thread, passes through the bottom of E, and also through the outerends of the band D, which is split sothat it can be compressed by thescrew to bind the standard B. His a thumbnut fitting the screw G, andbearing upon the side of the band D. This nut serves to bind the twoends of the band D together to clip the standard. The head of the screwGr bears in the sleeve E, which rests in a socket in one part of D, andthe shank ofthe screw passes through the'other part of D, so thatturning up the nut brings the two parts together.

J is a pin which passes through D, and through a slot cut in the shankof the screw G, to prevent the screw from turning. The arrangement ofparts above described permits the pointer to be turned, together withthe sleeve E and collar F, without turning and loosening the screw.

K is a circular cam, having an inclined upper surface making onecomplete turn around the standard B. It is furnished with a projectingflange, K, for turning it by hand, which extends a little out from thetop of the base A and rests upon it.- Under the flange is a coniin thebase to hold the standard from turning when the cam is operated.

N is a spring, acting upward againstthe base A and downward upon the barL, to hold the standard down upon the cam K.

O is a pin in the standard, which rests upon the top of the cam, and isheld in contact with it by the spring N.

The operation of my invention is as follows: When it is desired to setthe pointer at a given height above the base the thumb-nut His releasedjust sufficient to allow the pointer to turn and the clamp to slide upand down upon the standard. The end of the pointer is then turned so asto set it at the desired height, or as near it as can be readily done.lt is then again clamped, and a fine adjustment given to the pointer bymeans of the cam K, which is operated by turning the flange K. The cam Kpresses upward upon the pin 0, and moves the standard against the springN. If the cam is turned so as to lower the standard, the spring draws itdown.

My invention admits of a ready and easy means for determining thedistance moved up or down by the pointer. The cam K is provided Withgraduations 1 2 3 4, 850., as shown in Fig. 5, which show equalincrements in the height of the cam, and the cam being moved a certaindistance around under the pin shows the height it is raised. The pin 0is provided I with a line or index upon its end, to indicate 1o exactlyits position.

What I claim as my invention is 1. The loose sleeve E, the collar F, thescrew G, provided with a slot and pin, J, and the nut H, in combinationwith the band D, the standard B, and the pointer G, substantially as de-15 scribed.

2. The combination of the cam K, the standard B, provided with the pin'0 and the crossbar L, the base A, provided with'the guides M,-

and the spring N, substantially as described. 20

